Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3f75c188b2432c…

MALICIOUS

PDF

74.8 KB Created: 2021-03-28 17:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a92e99bf4883f3ebb60f601fd1542ce6 SHA-1: dd48c1e3b494983dea0fe6d33ba08db349eff604 SHA-256: 4c3f75c188b2432c6be1d02f99df73de8f0d62e58e6149552fadb255df96d325
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/strik?utm_term=legal+courses+in+canada PDF link annotation
    • https://cdn.sqhk.co/panajevem/fjhhbij/the_roman_empire_map_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/CiivghB/telegram_application_channels.pdfIn PDF document text
    • http://bet-info.ru/78377322273rjqnv.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/iiP99dT/bleach_vs_naruto_3._2_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/jgTaigq/83414936890.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/4914596.pdfIn PDF document text
    • http://tamakar.xyz/how_to_remove_jenn_air_microwave6xw89.pdfIn PDF document text
    • https://cdn.sqhk.co/zokelofid/b8hcSod/51080391583.pdfIn PDF document text
    • http://vashobereg.com/is_florida_too_hot_in_summerye1sp.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/aZheiia/counter_terrorism_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/heidfgh/89871637457.pdfIn PDF document text
    • https://xoniwolujejusun.weebly.com/uploads/1/3/4/4/134456196/zurag.pdfIn PDF document text
    • http://b0xberry.online/debidazzejkd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_f98b9682ec3e4e069a9d529ecce3b9bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davawina/aci_detailing_manual_2020_free_download.pdfIn PDF document text
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_5bc728b8b0f04f01a76d10eaae6f496c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/how_do_you_program_a_marantec_keypad.pdfIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_c7496b4883974f5f90c7d4f53076b16b.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 5048 bytes
SHA-256: 136f504d2e54e87fb1d99b09de1c8cbf2da829d84c034c46ebebb91bf6b5730f
font_01_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 11168 bytes
SHA-256: 62cfe2cb45bb4b9ce9356a2874ba6a06c53a6c1192c56af36526b90a71ca7103

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